CHAPTER 11 FCAN CONTROLLER
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User’s Manual U14492EJ3V0UD
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Bit Position
Bit Name
Function
6
MOM
Specifies the CAN module operation mode.
0: Normal operating mode
1: Diagnostic processing mode
Caution When in diagnostic processing mode (MOM bit = 1), the C1BRP register
can be accessed only when the CAN module has been set to initialization
mode (i.e., when the C1CTRL register’s ISTAT bit = INIT bit = 1).
When the CAN module is operating (i.e., when the C1CTRL register’s
ISTAT bit = 0), the C1BRP register cannot be used, and the CAN1 bus
diagnostic information register (refer to 11. 10 (27) CAN1 bus diagnostic
information register (C1DINF)) can be used instead.
5
SSHT
Specifies single shot mode.
0: Normal operating mode
1: Single shot mode
In single shot mode, the CAN module can transmit a message only one time. The
M_STATn register’s TRQ bit is then cleared (to 0) regardless of whether or not there are
any pending normal transmit operations (n = 00 to 31).
Also, if a bus error has occurred due to a transmission, it is handled as an incomplete
transmission.
Cautions 1. In single shot mode, even if the CAN lost in arbitration, it is handled as
a completed message transmission.
When in this mode, the BERR bit is set (to 1) but the error counter
value (refer to 11.10 (23) CAN1 error count register (C1ERC)) does not
change since there are no CAN bus errors.
2. During the time when the CAN module is active, the CPU switches
between normal operation mode and single shot mode without causing
any errors to occur on the CAN bus.
4
PBB
Specifies priority control for transmission.
0: Identifier (ID) based priority control
1: Message number based priority control
Ordinarily, priority for transmission is defined based on message IDs, but when the PBB bit
has been set (to 1) priority becomes based instead on the position of messages, so that
messages with lower message numbers have higher priority.
3
BERR
Indicates CAN bus error status.
0: CAN bus error was not detected
1: CAN bus error was detected at least once after bit was cleared
2
VALID
Indicates valid message detection status.
0: Valid message was not detected
1: Valid message was detected at least once after bit was cleared
Содержание V850E/IA1 mPD703116
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